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11851.

Which among the following compounds does not act as a reducing agent?

Answer»

`H_(2)O`
`H_(2)S`
`H_(2)Se`
`H_(2)Te`

Solution :The reducing POWER of hydride of 10TH group element increases as `H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te` because on MOVING `H_(2)O` to `H_(2)Te` size of central ATOM increases and hence thermal STABILITY decreases.
Discussion
11852.

Which one of the following is not zero order reaction?

Answer»

`H_(2(G))+Cl_(2(g))overset(hv)rarr 2HCl_((g))`
`N_(2)O(g)hArr N_(2(g))+(1)/(2)O_(2(g))`
`CH_(3)CHO_((g))rarrCH_(4(g))+CO_((g))`
`CH_(3)COCH_(3)+I_(2)overset(H^(+))rarr ICH_(2)COCH_(3)+HI`

Solution :`CH_(3)CHO_((g))rarrCH_(4(g))+CO_((g))`
Discussion
11853.

Two isomeric compounds (A) and (B) have C_(4)H_(11)N as molecular formula. Both on separately treating with HNO_(2) lose their N_(2) producing two isomeric alcohols (C) and (D) respectively of molecular formula C_(4)H_(10)O. (C) reacts with Lucas reagent immediately and units oxidation. (D) does not reacts with Lucas reagent in cold but can be easily oxidized. Complete methylation of either (A) or (B) is made which on decomposition does not produce 1-butene. Identify A to D.

Answer»


ANSWER :`A=(CH_(3))_(3))C-NH_(2), B=(CH_(3))_(2)CH-CH_(2)-NH_(2)`
`C=(CH_(3))_(3)C-OH, D=(CH_(3))_(2)CHCH_(2)OH`
Discussion
11854.

Which of the following is a molecular solid?a) Diamond b) Graphite c) ice d) Quartz.

Answer»


ANSWER :ICE
Discussion
11855.

Which of the followingdoes not have carboxyl group

Answer»

SALICYLIC ACID
PICRIC acid
succinic acid
malonic acid

ANSWER :B
Discussion
11856.

Which of the following contain maximum number of electrons in the antibonding molecular orbitals

Answer»

`O_(2)^(2-)`
`O_(2)`
`O_(2)^(-1)`
`O_(2)^(+)`

ANSWER :B
Discussion
11857.

Which of the following statements is not ture ?

Answer»

PARAMAGNETIC SUBSTANCES are weaklyattracted by a magnetic field.
Ferromagnetic substances cannotbe magnetisedpermanently .
The domainsin antiferromagneticsubstance are oppositelyoriented withrespectto each other.
Pairingof electronscancelstheirmagneticmoments in the DIAMAGNETIC substances.

Answer :B
Discussion
11858.

To avoid the precipitation of hydroxides of Ni^(2+), Co^(2+), Mn^(2+) along with those of the third group cations, the solutions should be

Answer»

HEATED with few drops of conc. `HNO_(3)`
heated with EXCESS of ammonium chloride
concentrated to small volume
none of these

Solution :FUNCTIONS of strong electrolyte `NH_(4)Cl` is to suppress the ionisation of `NH_(4)OH` so that the concentration of `OH^(-)` ions in the solution is DECREASED but it is sufficient to precipitate the third group basic radicals because the solubility product of group III hydroxides is lower than IV , V and VI group hydroxides.
Discussion
11859.

Units of rateconstnatis the samefor the elementary reactions : Reaction (1)A + B + C to products, Reaction (2) , A + 2B toproducts, Reaction(3), 3A toproducts. Substantiate.

Answer»

Solution :`A+B+Cto` products , RATE = k [A] [B] [C]
`A+2Bto` products , rate = `"k [A] "["2B"]^(2)`
`3Ato` products , rate `=k[A]^(3)`
Since the number of CONCENTRATION terms is the same for all the rate LAWS, the units of rate constant are also same. The units of rate constant of any of these REACTIONS are `L^(2)" mol"^(-2)s^(-1)`.
Discussion
11860.

When very dilute hypo is added to AgNO_(3)solution gives 'X'. The oxidation state of central metal atom in 'X' is

Answer»

`+4`
`+2`
`+1`
`-1`

ANSWER :C
Discussion
11861.

which of the following elements is good conductor of electricity?

Answer»

As
Sb
Bi
All

Answer :C
Discussion
11862.

Which of the following chemicals may be used to identify three unlabelled beakers containing conc. NaOH , conc. H_(2)S O_(4) and water ?

Answer»

`NH_(4) NO_(3)`
`NaCl`
`(NH_(4))_(2) CO_(3)`
`HCOONa`

ANSWER :A::C
Discussion
11863.

Which one of the following is a polysaccharide

Answer»

NYLON
AMYLOSE
Ribose
POLYETHYLENE

SOLUTION :Amylose is a POLYSACCHARIDE.
Discussion
11864.

What fraction of a reactant showing first order remains after 40 minute if t_1//_2is 20 minute ?

Answer»

`1//4`
`1//2`
`1//8`
`1//6`

ANSWER :A
Discussion
11865.

When a current of one ampere passes through a circuit for one second , how much quantity of silver is deposited ?

Answer»

`1.123 xx 10^(-6) KG`
1.123 kg
`1.123 xx 10^(-4) kg`
`1.123 xx 10^(-3) kg`

SOLUTION :96,500C`-=`108g of AG
1C `-= (108)/(96,500)=1.11xx10^(-6)Kg`
Discussion
11866.

What are the important consequences of Schottky and Frenkel defects in crystals ?

Answer»

Solution :The important consequences of Schottky and Frenkel defects in crystals are given below:
i) Because of these defects, the electrical conductivity of crystals increases. When an electric FIELD is applied, a nearby ion moves from its lattice site to occupy a hole. This creates a new hole and another nearby ion moves into it and so on. This process goes on and a hole moves from one end to other end. Thus, it CONDUCTS electricity.
(ii) Due to the presence of HOLES in the crystals, its density decreases.
(iii) The presence of holes also decreases like lattice energy of the crystal. Conscquently, the crystal becomes less stable.
Discussion
11867.

Which of the following compound possesses the " C-H" bond with the lower bond dissociation energy ?

Answer»

2.2-dimethyl propane
N - pentane
BENZENE
Toluene

Solution :Toluene has LOWEST bond DISSOCIATION energy as the C - H protons are INVOLVED in hyper conjugation.
Discussion
11868.

Which are is antidepressant drug ?

Answer»

IPRONIAZID 
PHENELZINE 
(A) and (B) both 
AMYTAL 

SOLUTION :(A) and (B) both
Discussion
11869.

Which of the following is not a pi bonded complex?

Answer»

Zeise's SALT
FERROCENE
Dibenzene chromium
Tetraethyl LEAD

ANSWER :D
Discussion
11870.

What isthesignificanceof leachingin theextractionofaluminium ?

Answer»

Solution :Bauxineis the principleore of aluminium. It usually contains silica `(SiO_2) `, ironoxide` (Fe_2O_3) `andtitanium oxide `(TiO_2) `as impurities. These impurities can beremovedbytheprocessof LEACHING. Duringleaching, thepowdered bauxine oreis heatedwithaconcentrated(45%) solution ofNaOHat 473 - 523 Kand35 - 36 barpressurewhen aluminadissolves as sodium meta- aluminate and silica`(SiO_2) `as sodiumsilicateleaving` Fe_2O_3, TiO_2 `and other impurities behind.
` underset ("Alumina")(Al_2O_3(s)) +2 NaOH (AQ)+3 H _2 O(l)overset ( 473 - 523K) underset (35 - 36" bar pressure") tounderset ("Sodium meta-aluminate")(2NA[Al(OH)_4](aq) `
` underset ("Silica")(SiO_(2)(l)) + 2 NaOH (aq) underset (473 - 523K) tounderset ("Sodiumsilicate")(Na_2SiO_3(aq)) +H_ 2 O(l) `
Theimpuritiesare filtered off andthe solution of sodiummeta- aluminateis neutralizedbypassing` CO_ 2` when hydratedaluminaseparatesoutwhilesodiumsilicateremainsinthesolution.
` ""2Na[Al(OH)_4](aq) +2CO _2(g)toAl_2 O _3. x H_2O(s) downarrow+2 NaHCO_3(aq) `
Thehydratedalumina thusobtainedisfiltered, driedandheatedto give backpure alumina.
` "" Al _2O_ 3 . xH _2 O (s)overset ( 1473 K) toAl_2 O _3(s)+xH_2O (g)`
Thus,the significanceof leachingintheextractionofaluminiumis topreparepurealuminafro thebauxiteore.
Discussion
11871.

What type of polymer can be considered novolac ?

Answer»

Linear
BRANCHED
Cross linked
(A) and (B) both

SOLUTION :Linear
Discussion
11872.

Whatare the differenttypes of RNA molecules which perform different functions ?

Answer»

Solution :(i) Messenger RNA (m - RNA).
(II) TRANSFER RNA (t-RNA).
(III) RIBOSOMAL RNA (r-RNA).
Discussion
11873.

When an acidified solution of ferrous ammonium sulphate is treated with potassium permanganate solution, the ion which is oxidized is

Answer»

`MnO_4^-`
`NH_4^+`
`FE^(2+)`
`SO_4^(2-)

ANSWER :C
Discussion
11874.

Which of the following alcohol has the highest boiling point ?

Answer»

Butan-2-ol
2-Methylpropan-2-ol
Propan-2-ol
Butan-1-ol

Solution :Creakr the MOLECULES mass, higher the BOILING point, further greather the BRANCHING, lesser the boiling point.
Discussion
11875.

Which is correct statement for CsBr_3 ?

Answer»

It is a COVALENT compound<BR>It CONTAINS `CS^+ and Br^-` molecule
It contains `Cs^+ and Br_3^-` molecule
It contains `Cs^+ , Br^- `and `Br_2` molecule.

Answer :D
Discussion
11876.

Which of the following reaction takes place in blast fumace during extraction of copper ?

Answer»

`2Cu_(2)S+3O_(2) to 2Cu_(2)O+2SO_(2)`
`2FeS+3O_(2) to 2FeO+2SO_(2)`
`2Cu_(2)O+Cu_(2)S to 6 Cu+SO_(2)`
All of these

Answer :D
Discussion
11877.

The standard state gibbs free energy for the given isomerization reaction cis-2-pentene hArr trans-2-pentence is -3.67kJ//mol at 400K. If more trans-2-pentence is added to the reaction vessel, then

Answer»

More cis-2-pentene is formed
EQULIBRIUM is SHIFTED in the forrward direction
Equlibreium remains unaffected
Additional trans-2-pentene is formed

SOLUTION :Equlibrium shifts BACKWARD by Le-chatelier's PRINCIPLE.
Discussion
11878.

Which product is obtained when bleaching powder is distilled with acetone:

Answer»

`CH_2Cl-CH_2Cl`
`CH_3-CHCl_2`
`CH_2=CHClcdot HCL`
NONE of these

Answer :B
Discussion
11879.

The two monomers used in the preparation of dextron are

Answer»

3-hydroxy butanoic acid and 3-hydroxy pentanoic acid
`in` amion caproic acid and glycine
isobutylene and isoprene
LACTIC acid and GLYCOLIC acid

Solution :Dextron is a polyacetic and polyglycotic acid polymer . The MONOMERS used are lactic acid and glycolic acid . It is copolymer and has ESTER linkage . It is used as friction modifier . It is added to LUBRICANTS to reduce surface friction
Discussion
11880.

Which of the following reactions would generated an electrolphile? (I) (CH_(3))_(3)CBr+"Anly. AlCl"_(3) (II) CH_(3)-CH=CH_(2)+overset(o+)H (III) C_(6)H_(5)COOH+H_(3)overset(o+)O (IV) HNO_(3)+H_(2)SO_(4)

Answer»

I, II and IV
I, II and III
I, II, III and IV
II, III and IV

Answer :A
Discussion
11881.

Which of the following compounds is cyclopentyldiethylamine?

Answer»




SOLUTION :
Discussion
11882.

Universal recipient in blood transfusion belongs to the group:

Answer»

Adrenaline
B
AB
O

Answer :C
Discussion
11883.

Write structures of different isomers corresponding to the molecular formula C_3 H_9N. Write IUPAC name of the isomers which will liberate nitrogen gas on treatment with nitrous acid.

Answer»

SOLUTION :In all FOUR structural isomers are possible. These are :
` 1^@` AMINE ` underset("Propan-1-amine ")(CH_3 CH_2 CH_2 NH_2) underset("Propan-2-amine ")(CH_3 - underset(NH_2)underset(|)(CH -CH_3)`
` 2^@ `Amines : ` underset("N-Methylethanamine ")(CH_3 -NH -C_2 H_5)`
`3^@`Amine : ` underset("N,N-dimethylmethanamine ")(CH_3 - overset(CH_3) overset(|)N-CH_3)`
Only `1^@`amines react with `HNO_2` to liberate `N_2` gas
` underset("Propan-1-amine ")(CH_3 CH_2 CH_2 NH_2 +HNO_2) tounderset("Propan-1-ol (major product)")(CH_3CH_2 CH_2 OH +H_2 O +N_2)`
Discussion
11884.

Which of the following is general formula of aldehyde and ketone

Answer»

`C_(N)H_(2n+2) O`
`C_(n)H_(2n)O_(2)`
`C_(n)H_(2n)O`
`C_(n)H_(2n+1)O`

Solution :Both aldehydes and KETONES have the same general formula `C_(n)H_(2n)O`.
Discussion
11885.

Use of chlorofluoro carbons is not encouraged because

Answer»

they are harmful to the eyes of people that use it
they damage the refrigerators and air conditioners
they EAT away the ozone in the atmospher
they destroy the oxygen layer.

Solution :Chlorofluorocarbon is USED in air-conditioning and in domestic refrigerators for COOLING purposes. Its main DRAWBACK is this, it is RESPONSIBLE for ozone depletion.
Discussion
11886.

Which of the following can form compounds with xenon

Answer»

`I_2`
`F_2`
`Br_2`
`AL`

ANSWER :B
Discussion
11887.

Which of the following has highest tendency for M^(+2)rarrM

Answer»

V
Cr
Co
Cu

Answer :D
Discussion
11888.

What happens But - 2 - ene is ozonised followed by hydrolysis?

Answer»

SOLUTION :
Discussion
11889.

Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces.

Answer»

The radius `r^(+)//r^(-)` INCREASES as coordination number increases.
As the difference in size of ions increases, coordination number increases.
When coordination number is eight, the `r^(+)//r^(-)` ratio lies between 0.732 to 1.000
In ionic SOLID of the TYPE Ax(ZnS, Wurtzite) the coordination number of `Zn^(2+)` and `S^(2-)` RESPECTIVELY are 4 and 4.

Solution :When coordination number is eight , the radius ratio `(r^(+))/(r^(-))` lies between 0.732 to 1.000.
Discussion
11890.

Which of the following is an acid ?

Answer»

<P>`Mg(OH)_(2)`
`P(OH)_(2)`
`Al(OH)_(3)`
`FE(OH)_(3)`

ANSWER :B
Discussion
11891.

Upon titrating a solution of weak monoprotic acid with a weak monoacidic base solution at equivalent point:

Answer»

`pH` in general weak would increase if both solution are first diluted to `10` times the original volume & then TITRATION is carries out
`pH` in general would DECREASE if both solution are first diluted to `10` times the original volume & then titration is carried out.
`pH` in general would remain same `(=7)` if both solutions are first diluted to `10` times the original volumes & then titration is carried out
`pH` in general coule be less than , greater then or equal to `7`if both solutions are first diluted to`10` times the original volume & then titration is carried out.

Solution :Salt of `WA-WB` formed at equivalence point has `pH` independent of concentration and depends on `pK_(a)` and `pK_(b)` of `WA` and `WB` respectively.
Discussion
11892.

Which one of the following is used in the manufacture of explosive dynamite and cordite by mixing it with clay?

Answer»

GLYCOL
GLYCEROL
ETHANOL
BENZALDEHYDE

SOLUTION :Glycerol
Discussion
11893.

Which of the following is used as a food preservative ?

Answer»

SALTS of sorbic ACID
Citric acid 
SUCRALOSE 
ASCORBIC acid 

ANSWER :A
Discussion
11894.

What happens when thionyl chloride reacts with benzoic acid?

Answer»

Solution :When Benzoic ACID reacts with thionyl chloride, BENZOYL chloride is formed as PRODUCT.
`UNDERSET("Benzoic acid")(C_6H_5COOH) + SOCl_2tounderset(" Benzoyl chloride ")(C_6H_5HOCl) + SO_2 + HCl`
Discussion
11895.

Which would undergoS_(N) 1 reaction faster in the following pair ? CH_(3) - CH_(2) - CH_(2) - Br " and " CH_(3) - underset(Br)underset(|) CH - CH_(3)

Answer»

SOLUTION :`CH_(3) - underset(Br)underset(|)CH - CH_(3)` WOULD undergo `S_(N)1` reaction faster in the pair because in `S_(N) 2` reaction , the nucleophile would face hindrance.
Discussion
11896.

Which one is an oxidising agent

Answer»

`FeSO_(4)`
`HNO_(3)`
`FeSO_(4). (NH_(4))_(2)SO_(4).6H_(2)O`
`H_(2)SO_(4)`

ANSWER :B::D
Discussion
11897.

Which of the following represents physical adsorption?

Answer»




ANSWER :D
Discussion
11898.

Whichis the only compoundof bismuth with +5oxidation state ?

Answer»

SOLUTION :BISMUTH PENTAFLUORIDE `(BiF_(5))`.
Discussion
11899.

The unit of cell constant is:-

Answer»

`OHM^(-1)CM^(-1)`
ohm cm
cm
`cm^(-1)`

ANSWER :D
Discussion
11900.

Which causes water pollution ?

Answer»

smoke/fly ash
automobile exhausts
aeroplanes
2,4-D and pesticides

Answer :D
Discussion